Numbers 5:18-20

18Then the priest will have the woman stand before the Lord, uncover the woman’s head, and put the grain offering for remembering in her hands, which is the grain offering of suspicion. The priest will hold in his hand the bitter water that brings a curse.

19Then the priest will put the woman under oath and say to the her, “If no other man has had sexual relations with you, and if you have not gone astray and become defiled while under your husband’s authority, may you be free from this bitter water that brings a curse.

20But if you have gone astray while under your husband’s authority, and if you have defiled yourself and some man other than your husband has had sexual relations with you….”